高速移动网络中AODV路由协议的改进

AODV ROUTING PROTOCOL IMPROVEMENT IN HIGHLY MOBILE NETWORKS

在节点高速移动的网络环境中,网络拓扑结构变化频繁,易导致路由中断。传统的AODV路由协议选择跳数最少的路径作为路由,而不考虑链路的稳定情况,并且只在路由中断后才开始路由修复,因此,无法适应节点高速移动的网络环境。针对上面存在的问题,提出一种对AODV进行改进的协议。该协议在选择路由时,考虑节点接收信号功率、路由跳数和节点剩余能量等因素,在路由维护阶段引入链路状态预测机制,使路由在失效前启动局部路由修复。仿真结果表明,相对于传统AODV协议,该改进协议提高了数据包的投递率,缩短了端到端的传输时延,能更好地适应节点高速移动的网络环境。

In networks environment with nodes moving in high speed, networks topology structure changes frequently and the route is ieasily interrupted. Regardless of the stability of links, traditional AODV routing protocol selects the path with least number of hops as the route, and starts the route repair only after the route is interrupted. Therefore, it can not be well adapted to the networks environment with highly mobile nodes. To overcome the problem above, this paper proposes an improved AODV routing protocol. Many factors are taken into consideration for selecting the routing path, including received signal power, routing hops and the residual energy of nodes. Furthermore, it introduces a prediction mechanism of link status in route maintenance phase, so that it can start local route repair before the routing failure. Simulation results show that the improved AODV routing protocol proposed improves the ratio of successful packet delivery and shortens the transmission delay from end to end as well compared with traditional AODV protocols. It is better suitable for the networks environment with highly mobile nodes.